PDF malware analysis — malicious · aa28b7af6db77b2f

MALICIOUS

PDF

96.2 KB Created: 2021-07-18 07:45:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: dcfef80c78f2e00bdcc1b440648f2c24 SHA-1: 497cc16715b3ff1654c613fb88017f0c06149a42 SHA-256: aa28b7af6db77b2feee7312d33d92547bfcca870cff6456d8524671b3c274924

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The PDF contains a link farm pointing to numerous compromised websites, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and a link farm indicates a probable phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9820

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM

PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
External URI info PDF_URI

PDF contains an external URL action
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b7e049121---1932217909.pdf In PDF document text
- https://machnhaduong.com/images/uploads/files/kopojalan.pdfIn PDF document text
- https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d982114d827d314fd0186505f43e9d7f/15995116522.pdfIn PDF document text
- https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/2a858176b7f6c9ddbca0a6fb7c30c509/zuwifikivifonavakisizel.pdfIn PDF document text
- https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/e5fd75b5735a5b56e0644ba45ab268f3/xezizus.pdfIn PDF document text
- https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6d8a414702f30afd3251c42846c4b8b0/dexidebemoboj.pdfIn PDF document text
- https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e30f69b8a---koxigukar.pdfIn PDF document text
- https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/0c89941ffb044da64e93561c6a01413e/nekarivelefe.pdfIn PDF document text
- https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c60e79db8---20446228321.pdfIn PDF document text
- http://perles-del-beya.com/userfiles/file/66558154929.pdfIn PDF document text
- https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/1e4807a02ff14574c57490efb4678554/kuwijonalizerajekag.pdfIn PDF document text
- http://jarauwerdaenzn.nl/userfiles/file/17168263126.pdfIn PDF document text
- http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/6d37cc519509c0558e01b0f53967053b/nibef.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c855f25a787---kevoduranabopolasi.pdfIn PDF document text
- http://hysansam.com/fckeditor/userfiles/image/61461075550.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/rigoxunosewetexonewizazes.pdfIn PDF document text
- http://samuiluxurytravel.com/Uploads/file/kuririnidakawani.pdfIn PDF document text
- http://singer-island-condos.com/userfiles/files/ratasujabafelozeb.pdfIn PDF document text
- http://harekatmemuru.com/images/Media/files/20819453612.pdfIn PDF document text
- http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717f1eba75a---37094799067.pdfIn PDF document text
- http://www.radio-kum.si/data/files/87026965770.pdfIn PDF document text
- https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/5f38a56d21416ddb078be5a4ca11ea12/42347339713.pdfIn PDF document text
- https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2106a35b28242a571f5fa2630f076c2c/pesojilotigomaj.pdfIn PDF document text
- http://immopolignano.lu/images/42319203732.pdfIn PDF document text
- http://bungefamily.com/clients/5233/File/didedawuvorog.pdfIn PDF document text
- http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609bde8c3a0f9---lipusulizunovevob.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=peter+and+meg+griffinPDF link annotation
- http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
- http://purl.org/dc/elements/1.1/In PDF document text
- http://ns.adobe.com/pdf/1.3/In PDF document text
- http://ns.adobe.com/xap/1.0/In PDF document text
- http://ns.adobe.com/xap/1.0/mm/In PDF document text
- http://ns.adobe.com/xap/1.0/rights/In PDF document text
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000117e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x117E9	16980 bytes
SHA-256: `3c56362226011592df3f35cd21bdb39b2e70845803fb31d20f8fe21f9e8701f6`
`font_01_sfnt_off00014441.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14441	10364 bytes
SHA-256: `70604e54cfc8b5955002e9de9a054dbb49e5c49209a8b80c8ae01896efd89660`
`font_02_sfnt_off00015b67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15B67	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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